they make very convenient containers for fragile surfaces around the house such as bedroom, desk or kitchen, because the glass bottom is clean and easy to clean, also it fits every little space on shelves or cupboards.

I often give some as a present, they are sustainable (depending on the plant specie you set in) and last for years.

the only rules you have to respect are the draining layers and the choice of the plant.....

My favorite plants for this kind of project are Sempervivum tectorum but many succulents will fit...try, think, and experiment...

then care about the draining material....small stones, clay balls, the a layer of sand, some people add a layer of charcoal, and finally add the planting soil or the original soil you found the plant in.